Fabrication and electrochemical properties of cylindrical hybrid supercapacitor using H2Ti12O25 as anode material

Abstract We successfully prepare H 2 Ti 12 O 25 by soft-chemical synthesis using Na 2 Ti 3 O 7 compounds, prepared by Na + /H + ion exchange and heating. Then, a cylindrical hybrid supercapacitor is fabricated by using H 2 Ti 12 O 25 as anode and activated carbon as cathode. The specific capacitance of hybrid supercapacitor using H 2 Ti 12 O 25 is 57 Fg −1 higher than that of hybrid supercapacitor using Li 4 Ti 5 O 12 (38 Fg −1 ). The hybrid supercapacitor using H 2 Ti 12 O 25 exhibit cycle performance with a capacitance retention of 65.3% available for battery application. The energy density is 35 W h kg −1 at a power density of 179 W kg −1 and 4 W h kg −1 at a power density of 5383 W kg −1 . These results show that the H 2 Ti 12 O 25 anode material is a promising electrode material for hybrid supercapacitor.